The original song is still available here, and can be found by searching via the "Digitrad and Forum Search" on the main Forum page for dark island.

A more recent (and not very impressive) set of lyrics written to the tune (which is a recent composition, and still in copyright) has indeed been been withdrawn, apparantly at the insistence of people who thought that, while it was alright for them to use somebody else's original composition to make money for themselves, it was not alright for anybody else to make their rather poor lyrics available to others.